Grok 4.1 Fast vs Kimi K2

Compare Grok 4.1 Fast by xAI against Kimi K2 by Moonshot AI, tested across 35 shared challenges. Updated April 2026.

Which is better, Grok 4.1 Fast or Kimi K2?

Grok 4.1 Fast and Kimi K2 are both competitive models. Compare their real outputs side by side below.

Key Differences Between Grok 4.1 Fast and Kimi K2

Grok 4.1 Fast is made by xai while Kimi K2 is from moonshotai.

Our Verdict
Grok 4.1 Fast
Grok 4.1 Fast
Kimi K2
Kimi K2Runner-up

No community votes yet. On paper, Grok 4.1 Fast has the edge — newer, major provider backing.

Too close to call
Writing DNA

Style Comparison

Similarity
92%

Kimi K2 uses 68.5x more emoji

Grok 4.1 Fast
Kimi K2
67%Vocabulary63%
15wSentence Length19w
0.17Hedging0.35
4.7Bold4.2
3.7Lists3.6
0.00Emoji0.68
0.99Headings0.61
0.14Transitions0.06
Based on 24 + 22 text responses
vs

Ask them anything yourself

Grok 4.1 FastKimi K2

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
Free preview13 of 58 slides
FAQ

Common questions